I would like to have a little more space between the rows of an array for better clarity. I tried \vspace{} at the end of the rows but LateX ignored it. I can accomplish something close to what I want with extra rows but that adds a bit more space than I'd like (but I can live with it). Here's what I have:
\documentclass{amsbook}
\begin{document}
BEFORE:
\[
f(n) = \left\{
\begin{array}{cl}
0 & \text{if n=1 }\\
\frac{n}{2} & \text{if n is even} \\
-\left( \frac{n-1}{2} \right) & \text{if n $\ge$ 1 is odd}
\end{array} \right.
\]
This is cramped visually, especially given my poor eyesight.
AFTER:
\[
f(n) = \left\{
\begin{array}{cl}
0 & \text{if n=1 }\\
\\
\frac{n}{2} & \text{if n is even} \\
\\
-\left( \frac{n-1}{2} \right) & \text{if n $\ge$ 1 is odd}
\end{array} \right.
\]
This works but is overkill.
\end{document}
Best Answer
The
\\
command has an optional length parameter. So you can add, e.g.,according to your taste.
To tell the truth, I would rather write
-\left( \dfrac{n-1}{2} \right) & \text{if $n \ge 1$ is odd}
and so on, so that the number $n$ is always in math mode.